" with " ^ NCicPp.ppterm ~metasenv ~subst ~context t2));
;;
-let mk_appl hd tl =
- match hd with
- | NCic.Appl l -> NCic.Appl (l@tl)
- | _ -> NCic.Appl (hd :: tl)
-;;
-
-let flexible l =
- List.exists
- (function
- | NCic.Meta _
- | NCic.Appl (NCic.Meta _::_) -> true
- | _ -> false) l
+let mk_appl ~upto hd tl =
+ NCicReduction.head_beta_reduce ~upto
+ (match hd with
+ | NCic.Appl l -> NCic.Appl (l@tl)
+ | _ -> NCic.Appl (hd :: tl))
;;
exception WrongShape;;
-let eta_reduce =
- let delift_if_not_occur body orig =
+let eta_reduce subst t =
+ let delift_if_not_occur body =
try
- NCicSubstitution.psubst ~avoid_beta_redexes:true
- (fun () -> raise WrongShape) [()] body
- with WrongShape -> orig
+ Some (NCicSubstitution.psubst ~avoid_beta_redexes:true
+ (fun () -> raise WrongShape) [()] body)
+ with WrongShape -> None
+ in
+ let rec eat_lambdas ctx = function
+ | NCic.Lambda (name, src, tgt) ->
+ eat_lambdas ((name, src) :: ctx) tgt
+ | NCic.Meta (i,lc) as t->
+ (try
+ let _,_,t,_ = NCicUtils.lookup_subst i subst in
+ let t = NCicSubstitution.subst_meta lc t in
+ eat_lambdas ctx t
+ with Not_found -> ctx, t)
+ | t -> ctx, t
in
- function
- | NCic.Lambda(_, _, NCic.Appl [hd; NCic.Rel 1]) as orig ->
- delift_if_not_occur hd orig
- | NCic.Lambda(_, _, NCic.Appl (hd :: l)) as orig
- when HExtlib.list_last l = NCic.Rel 1 ->
- let body =
- let args, _ = HExtlib.split_nth (List.length l - 1) l in
- NCic.Appl (hd::args)
- in
- delift_if_not_occur body orig
- | t -> t
+ let context_body = eat_lambdas [] t in
+ let rec aux = function
+ | [],body -> body
+ | (name, src)::ctx, (NCic.Appl (hd::[NCic.Rel 1]) as bo) ->
+ (match delift_if_not_occur hd with
+ | None -> aux (ctx,NCic.Lambda(name,src, bo))
+ | Some bo -> aux (ctx,bo))
+ | (name, src)::ctx, (NCic.Appl args as bo)
+ when HExtlib.list_last args = NCic.Rel 1 ->
+ let args, _ = HExtlib.split_nth "NU 1" (List.length args - 1) args in
+ (match delift_if_not_occur (NCic.Appl args) with
+ | None -> aux (ctx,NCic.Lambda(name,src, bo))
+ | Some bo -> aux (ctx,bo))
+ | (name, src) :: ctx, t ->
+ aux (ctx,NCic.Lambda(name,src, t))
+ in
+ aux context_body
;;
-
+
module C = NCic;;
module Ref = NReference;;
let inside c = indent := !indent ^ String.make 1 c;;
let outside () = indent := String.sub !indent 0 (String.length !indent -1);;
-(*
let pp s =
prerr_endline (Printf.sprintf "%-20s" !indent ^ " " ^ Lazy.force s)
;;
-*)
let pp _ = ();;
aux () t
;;
-let rec beta_expand num test_eq_only swap metasenv subst context t arg =
- let rec aux (n,context,test_eq_only as k) (metasenv, subst as acc) t' =
+let is_locked n subst =
try
- let metasenv, subst =
- if swap then
- unify test_eq_only metasenv subst context t' (NCicSubstitution.lift n arg)
- else
- unify test_eq_only metasenv subst context (NCicSubstitution.lift n arg) t'
- in
- (metasenv, subst), NCic.Rel (1 + n)
- with Uncertain _ | UnificationFailure _ ->
- match t' with
- | NCic.Rel m as orig ->
- (metasenv, subst), if m <= n then orig else NCic.Rel (m+1)
- (* andrea: in general, beta_expand can create badly typed
- terms. This happens quite seldom in practice, UNLESS we
- iterate on the local context. For this reason, we renounce
- to iterate and just lift *)
- | NCic.Meta (i,(shift,lc)) ->
- (metasenv,subst), NCic.Meta (i,(shift+1,lc))
- | NCic.Prod (name, src, tgt) as orig ->
- let (metasenv, subst), src1 = aux (n,context,true) acc src in
- let k = n+1, (name, NCic.Decl src) :: context, test_eq_only in
- let ms, tgt1 = aux k (metasenv, subst) tgt in
- if src == src1 && tgt == tgt1 then ms, orig else
- ms, NCic.Prod (name, src1, tgt1)
- | t ->
- NCicUntrusted.map_term_fold_a
- (fun e (n,ctx,teq) -> n+1,e::ctx,teq) k aux acc t
+ match NCicUtils.lookup_subst n subst with
+ | Some tag, _,_,_ when NCicMetaSubst.is_out_scope_tag tag -> true
+ | _ -> false
+ with NCicUtils.Subst_not_found _ -> false
+;;
- in
- let argty = NCicTypeChecker.typeof ~metasenv ~subst context arg in
- let fresh_name = "Hbeta" ^ string_of_int num in
- let (metasenv,subst), t1 =
- aux (0, context, test_eq_only) (metasenv, subst) t in
- let t2 = eta_reduce (NCic.Lambda (fresh_name,argty,t1)) in
- try
- ignore(NCicTypeChecker.typeof ~metasenv ~subst context t2);
- metasenv, subst, t2
- with NCicTypeChecker.TypeCheckerFailure _ ->
- metasenv, subst, NCic.Lambda ("_", argty, NCicSubstitution.lift 1 arg)
-and beta_expand_many test_equality_only swap metasenv subst context t args =
-(* (*D*) inside 'B'; try let rc = *)
- pp (lazy (String.concat ", "
- (List.map (NCicPp.ppterm ~metasenv ~subst ~context)
- args) ^ " ∈ " ^ NCicPp.ppterm ~metasenv ~subst ~context t));
- let _, subst, metasenv, hd =
- List.fold_right
- (fun arg (num,subst,metasenv,t) ->
- let metasenv, subst, t =
- beta_expand num test_equality_only swap metasenv subst context t arg
- in
- num+1,subst,metasenv,t)
- args (1,subst,metasenv,t)
- in
- pp (lazy ("Head syntesized by b-exp: " ^
- NCicPp.ppterm ~metasenv ~subst ~context hd));
- metasenv, subst, hd
-(* (*D*) in outside (); rc with exn -> outside (); raise exn *)
-
-and instantiate test_eq_only metasenv subst context n lc t swap =
+let rec lambda_intros metasenv subst context t args =
+ let tty = NCicTypeChecker.typeof ~metasenv ~subst context t in
+ let argsty = List.map (NCicTypeChecker.typeof ~metasenv ~subst context) args in
+ let rec mk_lambda context n = function
+ | [] ->
+ let metasenv, _, bo, _ =
+ NCicMetaSubst.mk_meta metasenv context
+ (`WithType (NCicSubstitution.lift n tty))
+ in
+ metasenv, bo
+ | ty::tail ->
+ let name = "HBeta"^string_of_int n in
+ let ty = NCicSubstitution.lift n ty in
+ let metasenv, bo = mk_lambda ((name,NCic.Decl ty)::context) (n+1) tail in
+ metasenv, NCic.Lambda (name, ty, bo)
+ in
+ mk_lambda context 0 argsty
+
+and instantiate hdb test_eq_only metasenv subst context n lc t swap =
(*D*) inside 'I'; try let rc =
pp (lazy(string_of_int n ^ " :=?= "^
NCicPp.ppterm ~metasenv ~subst ~context t));
let unify test_eq_only m s c t1 t2 =
- if swap then unify test_eq_only m s c t2 t1
- else unify test_eq_only m s c t1 t2
+ if swap then unify hdb test_eq_only m s c t2 t1
+ else unify hdb test_eq_only m s c t1 t2
in
let name, ctx, ty = NCicUtils.lookup_meta n metasenv in
let metasenv, subst, t =
pp msg; assert false
in
let lty = NCicSubstitution.subst_meta lc ty in
- pp (lazy ("On the types: " ^
- NCicPp.ppterm ~metasenv ~subst ~context:ctx ty ^ " ~~~ " ^
- NCicPp.ppterm ~metasenv ~subst ~context lty ^ " === "
- ^ NCicPp.ppterm ~metasenv ~subst ~context ty_t));
- let metasenv,subst= unify test_eq_only metasenv subst context lty ty_t in
- metasenv, subst, t
+ match ty_t with
+ | NCic.Implicit _ ->
+ raise (UnificationFailure
+ (lazy "trying to unify a term with a type"))
+ | ty_t ->
+ pp (lazy ("On the types: " ^
+ NCicPp.ppterm ~metasenv ~subst ~context:ctx ty ^ " ~~~ " ^
+ NCicPp.ppterm ~metasenv ~subst ~context lty ^ " === "
+ ^ NCicPp.ppterm ~metasenv ~subst ~context ty_t));
+ let metasenv,subst =
+ unify test_eq_only metasenv subst context lty ty_t in
+ metasenv, subst, t
in
pp (lazy(string_of_int n ^ " := 111 = "^
NCicPp.ppterm ~metasenv ~subst ~context t));
let (metasenv, subst), t =
- try NCicMetaSubst.delift metasenv subst context n lc t
+ try
+ NCicMetaSubst.delift
+ ~unify:(fun m s c t1 t2 ->
+ let ind = !indent in
+ let res =
+ try Some (unify test_eq_only m s c t1 t2 )
+ with UnificationFailure _ | Uncertain _ -> None
+ in
+ indent := ind; res)
+ metasenv subst context n lc t
with NCicMetaSubst.Uncertain msg ->
pp (lazy ("delift fails: " ^ Lazy.force msg));
raise (Uncertain msg)
metasenv, subst
(*D*) in outside(); rc with exn -> outside (); raise exn
-and unify test_eq_only metasenv subst context t1 t2 =
- (*D*) inside 'U'; try let rc =
+and unify hdb test_eq_only metasenv subst context t1 t2 =
+ (*D*) inside 'U'; try let rc =
let fo_unif test_eq_only metasenv subst t1 t2 =
(*D*) inside 'F'; try let rc =
- pp (lazy(" " ^ NCicPp.ppterm ~metasenv ~subst ~context t1 ^ " === " ^
- NCicPp.ppterm ~metasenv ~subst ~context t2));
+ pp (lazy(" " ^ NCicPp.ppterm ~metasenv ~subst ~context t1 ^ " ==?== " ^
+ NCicPp.ppterm ~metasenv ~subst ~context t2 ^ "\n" ^ NCicPp.ppmetasenv
+ ~subst metasenv));
if t1 === t2 then
metasenv, subst
else
match (t1,t2) with
+ | C.Appl [_], _ | _, C.Appl [_] | C.Appl [], _ | _, C.Appl []
+ | C.Appl (C.Appl _::_), _ | _, C.Appl (C.Appl _::_) ->
+ prerr_endline "Appl [Appl _;_] or Appl [] or Appl [_] invariant";
+ assert false
| (C.Sort (C.Type a), C.Sort (C.Type b)) when not test_eq_only ->
if NCicEnvironment.universe_leq a b then metasenv, subst
else raise (fail_exc metasenv subst context t1 t2)
| (C.Lambda (name1,s1,t1), C.Lambda(_,s2,t2))
| (C.Prod (name1,s1,t1), C.Prod(_,s2,t2)) ->
- let metasenv, subst = unify true metasenv subst context s1 s2 in
- unify test_eq_only metasenv subst ((name1, C.Decl s1)::context) t1 t2
+ let metasenv, subst = unify hdb true metasenv subst context s1 s2 in
+ unify hdb test_eq_only metasenv subst ((name1, C.Decl s1)::context) t1 t2
| (C.LetIn (name1,ty1,s1,t1), C.LetIn(_,ty2,s2,t2)) ->
- let metasenv,subst=unify test_eq_only metasenv subst context ty1 ty2 in
- let metasenv,subst=unify test_eq_only metasenv subst context s1 s2 in
+ let metasenv,subst=unify hdb test_eq_only metasenv subst context ty1 ty2 in
+ let metasenv,subst=unify hdb test_eq_only metasenv subst context s1 s2 in
let context = (name1, C.Def (s1,ty1))::context in
- unify test_eq_only metasenv subst context t1 t2
+ unify hdb test_eq_only metasenv subst context t1 t2
| (C.Meta (n1,(s1,l1 as lc1)),C.Meta (n2,(s2,l2 as lc2))) when n1 = n2 ->
(try
(fun t1 t2 (metasenv, subst, to_restrict, i) ->
try
let metasenv, subst =
- unify test_eq_only metasenv subst context
+ unify hdb test_eq_only metasenv subst context
(NCicSubstitution.lift s1 t1) (NCicSubstitution.lift s2 t2)
in
metasenv, subst, to_restrict, i-1
let _,_,term,_ = NCicUtils.lookup_subst n1 subst in
let term1 = NCicSubstitution.subst_meta lc1 term in
let term2 = NCicSubstitution.subst_meta lc2 term in
- unify test_eq_only metasenv subst context term1 term2
+ unify hdb test_eq_only metasenv subst context term1 term2
with NCicUtils.Subst_not_found _-> raise (UnificationFailure msg))
+
+ | _, NCic.Meta (n, _) when is_locked n subst ->
+ (let (metasenv, subst), i =
+ match NCicReduction.whd ~subst context t1 with
+ | NCic.Appl (NCic.Meta (i,l)::args) when
+ not (NCicMetaSubst.flexible subst args)
+ ->
+ let metasenv, lambda_Mj =
+ lambda_intros metasenv subst context t1 args
+ in
+ unify hdb test_eq_only metasenv subst context
+ (C.Meta (i,l)) lambda_Mj,
+ i
+ | NCic.Meta (i,_) -> (metasenv, subst), i
+ | _ -> assert false
+ in
+ let t1 = NCicReduction.whd ~subst context t1 in
+ let j, lj =
+ match t1 with NCic.Meta (j,l) -> j, l | _ -> assert false
+ in
+ let metasenv, subst =
+ instantiate hdb test_eq_only metasenv subst context j lj t2 true
+ in
+ (try
+ let name, ctx, term, ty = NCicUtils.lookup_subst i subst in
+ let term = eta_reduce subst term in
+ let subst = List.filter (fun (j,_) -> j <> i) subst in
+ metasenv, ((i, (name, ctx, term, ty)) :: subst)
+ with Not_found -> assert false))
| C.Meta (n,lc), t ->
(try
let _,_,term,_ = NCicUtils.lookup_subst n subst in
let term = NCicSubstitution.subst_meta lc term in
- unify test_eq_only metasenv subst context term t
+ unify hdb test_eq_only metasenv subst context term t
with NCicUtils.Subst_not_found _->
- instantiate test_eq_only metasenv subst context n lc t false)
+ instantiate hdb test_eq_only metasenv subst context n lc
+ (NCicReduction.head_beta_reduce ~subst t) false)
| t, C.Meta (n,lc) ->
(try
let _,_,term,_ = NCicUtils.lookup_subst n subst in
let term = NCicSubstitution.subst_meta lc term in
- unify test_eq_only metasenv subst context t term
+ unify hdb test_eq_only metasenv subst context t term
with NCicUtils.Subst_not_found _->
- instantiate test_eq_only metasenv subst context n lc t true)
+ instantiate hdb test_eq_only metasenv subst context n lc
+ (NCicReduction.head_beta_reduce ~subst t) true)
| NCic.Appl (NCic.Meta (i,l)::args), _ when List.mem_assoc i subst ->
let _,_,term,_ = NCicUtils.lookup_subst i subst in
let term = NCicSubstitution.subst_meta l term in
- unify test_eq_only metasenv subst context (mk_appl term args) t2
+ unify hdb test_eq_only metasenv subst context
+ (mk_appl ~upto:(List.length args) term args) t2
| _, NCic.Appl (NCic.Meta (i,l)::args) when List.mem_assoc i subst ->
let _,_,term,_ = NCicUtils.lookup_subst i subst in
let term = NCicSubstitution.subst_meta l term in
- unify test_eq_only metasenv subst context t1 (mk_appl term args)
+ unify hdb test_eq_only metasenv subst context t1
+ (mk_appl ~upto:(List.length args) term args)
| NCic.Appl (NCic.Meta (i,_)::_ as l1),
NCic.Appl (NCic.Meta (j,_)::_ as l2) when i=j ->
(try
List.fold_left2
(fun (metasenv, subst) t1 t2 ->
- unify test_eq_only metasenv subst context t1 t2)
+ unify hdb test_eq_only metasenv subst context t1 t2)
(metasenv,subst) l1 l2
with Invalid_argument _ ->
raise (fail_exc metasenv subst context t1 t2))
- | NCic.Appl (NCic.Meta (i,l)::args), _ when not (flexible args) ->
+ | NCic.Appl (NCic.Meta (i,l)::args), _ when
+ not (NCicMetaSubst.flexible subst args) ->
(* we verify that none of the args is a Meta,
since beta expanding w.r.t a metavariable makes no sense *)
- let metasenv, subst, beta_expanded =
- beta_expand_many
- test_eq_only false
- metasenv subst context t2 args
+ let metasenv, lambda_Mj =
+ lambda_intros metasenv subst context t1 args
in
- unify test_eq_only metasenv subst context
- (C.Meta (i,l)) beta_expanded
-
- | _, NCic.Appl (NCic.Meta (i,l)::args) when not(flexible args) ->
- let metasenv, subst, beta_expanded =
- beta_expand_many
- test_eq_only true
- metasenv subst context t1 args
+ let metasenv, subst =
+ unify hdb test_eq_only metasenv subst context
+ (C.Meta (i,l)) lambda_Mj
+ in
+ let metasenv, subst =
+ unify hdb test_eq_only metasenv subst context t1 t2
+ in
+ (try
+ let name, ctx, term, ty = NCicUtils.lookup_subst i subst in
+ let term = eta_reduce subst term in
+ let subst = List.filter (fun (j,_) -> j <> i) subst in
+ metasenv, ((i, (name, ctx, term, ty)) :: subst)
+ with Not_found -> assert false)
+
+ | _, NCic.Appl (NCic.Meta (i,l)::args) when
+ not(NCicMetaSubst.flexible subst args) ->
+ let metasenv, lambda_Mj =
+ lambda_intros metasenv subst context t2 args
in
- unify test_eq_only metasenv subst context
- beta_expanded (C.Meta (i,l))
+ let metasenv, subst =
+ unify hdb test_eq_only metasenv subst context
+ lambda_Mj (C.Meta (i,l))
+ in
+ let metasenv, subst =
+ unify hdb test_eq_only metasenv subst context t1 t2
+ in
+ (try
+ let name, ctx, term, ty = NCicUtils.lookup_subst i subst in
+ let term = eta_reduce subst term in
+ let subst = List.filter (fun (j,_) -> j <> i) subst in
+ metasenv, ((i, (name, ctx, term, ty)) :: subst)
+ with Not_found -> assert false)
(* processing this case here we avoid a useless small delta step *)
| (C.Appl ((C.Const r1) as _hd1::tl1), C.Appl (C.Const r2::tl2))
let relevance = NCicEnvironment.get_relevance r1 in
let relevance = match r1 with
| Ref.Ref (_,Ref.Con (_,_,lno)) ->
- let _,relevance = HExtlib.split_nth lno relevance in
+ let relevance =
+ try snd (HExtlib.split_nth "NU 2" lno relevance)
+ with Failure _ -> []
+ in
HExtlib.mk_list false lno @ relevance
| _ -> relevance
in
let b, relevance =
match relevance with b::tl -> b,tl | _ -> true, [] in
let metasenv, subst =
- try unify test_eq_only metasenv subst context t1 t2
+ try unify hdb test_eq_only metasenv subst context t1 t2
with UnificationFailure _ | Uncertain _ when not b ->
metasenv, subst
in
| (C.Match (Ref.Ref (_,Ref.Ind (_,tyno,_)) as ref1,outtype1,term1,pl1),
C.Match (ref2,outtype2,term2,pl2)) ->
- let _,_,itl,_,_ = NCicEnvironment.get_checked_indtys ref1 in
- let _,_,ty,_ = List.nth itl tyno in
- let rec remove_prods ~subst context ty =
+ let _,_,itl,_,_ = NCicEnvironment.get_checked_indtys ref1 in
+ let _,_,ty,_ = List.nth itl tyno in
+ let rec remove_prods ~subst context ty =
let ty = NCicReduction.whd ~subst context ty in
match ty with
| C.Sort _ -> ty
- | C.Prod (name,so,ta) ->
+ | C.Prod (name,so,ta) ->
remove_prods ~subst ((name,(C.Decl so))::context) ta
| _ -> assert false
in
| C.Sort C.Prop -> true
| _ -> false
in
- let rec remove_prods ~subst context ty =
- let ty = NCicReduction.whd ~subst context ty in
- match ty with
- | C.Sort _ -> ty
- | C.Prod (name,so,ta) ->
- remove_prods ~subst ((name,(C.Decl so))::context) ta
- | _ -> assert false
- in
if not (Ref.eq ref1 ref2) then
raise (uncert_exc metasenv subst context t1 t2)
else
let metasenv, subst =
- unify test_eq_only metasenv subst context outtype1 outtype2 in
+ unify hdb test_eq_only metasenv subst context outtype1 outtype2 in
let metasenv, subst =
- try unify test_eq_only metasenv subst context term1 term2
+ try unify hdb test_eq_only metasenv subst context term1 term2
with UnificationFailure _ | Uncertain _ when is_prop ->
metasenv, subst
in
(try
List.fold_left2
(fun (metasenv,subst) ->
- unify test_eq_only metasenv subst context)
+ unify hdb test_eq_only metasenv subst context)
(metasenv, subst) pl1 pl2
with Invalid_argument _ ->
raise (uncert_exc metasenv subst context t1 t2))
| _ -> raise (uncert_exc metasenv subst context t1 t2)
(*D*) in outside(); rc with exn -> outside (); raise exn
in
+ let try_hints metasenv subst t1 t2 (* exc*) =
+(*
+ prerr_endline ("\nProblema:\n" ^
+ NCicPp.ppterm ~metasenv ~subst ~context t1 ^ " =?= " ^
+ NCicPp.ppterm ~metasenv ~subst ~context t2);
+*)
+ let candidates =
+ NCicUnifHint.look_for_hint hdb metasenv subst context t1 t2
+ in
+ let rec cand_iter = function
+ | [] -> None (* raise exc *)
+ | (metasenv,(c1,c2),premises)::tl ->
+(*
+ prerr_endline ("\nProvo il candidato:\n" ^
+ String.concat "\n"
+ (List.map
+ (fun (a,b) ->
+ NCicPp.ppterm ~metasenv ~subst ~context a ^ " =?= " ^
+ NCicPp.ppterm ~metasenv ~subst ~context b) premises) ^
+ "\n-------------------------------------------\n"^
+ NCicPp.ppterm ~metasenv ~subst ~context c1 ^ " = " ^
+ NCicPp.ppterm ~metasenv ~subst ~context c2);
+*)
+ try
+ let metasenv,subst =
+ fo_unif test_eq_only metasenv subst t1 c1 in
+ let metasenv,subst =
+ fo_unif test_eq_only metasenv subst c2 t2 in
+ let metasenv,subst =
+ List.fold_left
+ (fun (metasenv, subst) (x,y) ->
+ unify hdb test_eq_only metasenv subst context x y)
+ (metasenv, subst) premises
+ in
+ Some (metasenv, subst)
+ with
+ UnificationFailure _ | Uncertain _ ->
+ cand_iter tl
+ in
+ cand_iter candidates
+ in
let height_of = function
| NCic.Const (Ref.Ref (_,Ref.Def h))
| NCic.Const (Ref.Ref (_,Ref.Fix (_,_,h)))
NCicReduction.reduce_machine ~delta:max_int ~subst context m1,
NCicReduction.reduce_machine ~delta:max_int ~subst context m2
in
- let small_delta_step
+ let small_delta_step ~subst
((_,_,t1,_ as m1, norm1) as x1) ((_,_,t2,_ as m2, norm2) as x2)
=
assert (not (norm1 && norm2));
function
| ((k1,e1,t1,s1),norm1 as m1),((k2,e2,t2,s2),norm2 as m2) ->
(*D*) inside 'M'; try let rc =
-(*
- pp (lazy((if are_normal then "*" else " ") ^ " " ^
- NCicPp.ppterm ~metasenv ~subst ~context (NCicReduction.unwind m1) ^
+ pp (lazy("UM: " ^
+ NCicPp.ppterm ~metasenv ~subst ~context
+ (NCicReduction.unwind (k1,e1,t1,s1)) ^
" === " ^
- NCicPp.ppterm ~metasenv ~subst ~context (NCicReduction.unwind m2)));
-*)
+ NCicPp.ppterm ~metasenv ~subst ~context
+ (NCicReduction.unwind (k2,e2,t2,s2))));
+pp (lazy (string_of_bool norm1 ^ " ?? " ^ string_of_bool norm2));
let relevance = [] (* TO BE UNDERSTOOD
match t1 with
| C.Const r -> NCicEnvironment.get_relevance r
with UnificationFailure _ | Uncertain _ when not b ->
metasenv, subst
in
- let rec check_stack l1 l2 r (metasenv, subst) =
+ let rec check_stack l1 l2 r todo =
match l1,l2,r with
- | x1::tl1, x2::tl2, r::tr ->
- check_stack tl1 tl2 tr
- (unif_from_stack x1 x2 r metasenv subst)
- | x1::tl1, x2::tl2, [] ->
- check_stack tl1 tl2 []
- (unif_from_stack x1 x2 true metasenv subst)
+ | x1::tl1, x2::tl2, r::tr-> check_stack tl1 tl2 tr ((x1,x2,r)::todo)
+ | x1::tl1, x2::tl2, []-> check_stack tl1 tl2 [] ((x1,x2,true)::todo)
| l1, l2, _ ->
- fo_unif test_eq_only metasenv subst
- (NCicReduction.unwind (k1,e1,t1,List.rev l1))
- (NCicReduction.unwind (k2,e2,t2,List.rev l2))
+ NCicReduction.unwind (k1,e1,t1,List.rev l1),
+ NCicReduction.unwind (k2,e2,t2,List.rev l2),
+ todo
in
- try check_stack (List.rev s1) (List.rev s2) relevance (metasenv,subst)
+ let hh1,hh2,todo=check_stack (List.rev s1) (List.rev s2) relevance [] in
+ try
+ let metasenv,subst = fo_unif test_eq_only metasenv subst hh1 hh2 in
+ List.fold_left
+ (fun (metasenv,subst) (x1,x2,r) ->
+ unif_from_stack x1 x2 r metasenv subst
+ ) (metasenv,subst) todo
with UnificationFailure _ | Uncertain _ when not (norm1 && norm2) ->
- unif_machines metasenv subst (small_delta_step m1 m2)
+ unif_machines metasenv subst (small_delta_step ~subst m1 m2)
(*D*) in outside(); rc with exn -> outside (); raise exn
in
try fo_unif test_eq_only metasenv subst t1 t2
- with UnificationFailure msg | Uncertain msg as exn ->
- try
- unif_machines metasenv subst
- (put_in_whd (0,[],t1,[]) (0,[],t2,[]))
- with
- | UnificationFailure _ -> raise (UnificationFailure msg)
- | Uncertain _ -> raise exn
+ with
+ | UnificationFailure msg as exn ->
+ (try
+ unif_machines metasenv subst
+ (put_in_whd (0,[],t1,[]) (0,[],t2,[]))
+ with
+ | UnificationFailure _ -> raise (UnificationFailure msg)
+ | Uncertain _ -> raise exn)
+ | Uncertain msg as exn ->
+ match try_hints metasenv subst t1 t2 with
+ | Some x -> x
+ | None ->
+ try
+ unif_machines metasenv subst
+ (put_in_whd (0,[],t1,[]) (0,[],t2,[]))
+ with
+ | UnificationFailure _ -> raise (UnificationFailure msg)
+ | Uncertain _ -> raise exn
(*D*) in outside(); rc with exn -> outside (); raise exn
;;
-let unify =
+let unify hdb ?(test_eq_only=false) =
indent := "";
- unify false;;
-
-
+ unify hdb test_eq_only;;
projects / helm.git / blobdiff